A New Bicyclic Dipeptide Isostere with Pyrrolizidinone Skeleton
作者:Franca M. Cordero、Federica Pisaneschi、Karina Meschini Batista、Silvia Valenza、Fabrizio Machetti、Alberto Brandi
DOI:10.1021/jo0487653
日期:2005.2.1
The synthesis of a new conformationally constrained Gly-(s-cis)Pro Turn Mimetic (GPTM) in both racemic and enantiomerically pure forms and their incorporation into peptides 18, 21, and 24 are reported. The synthetic strategy adopted to assemble the bicyclic pyrrolizidinone skeleton is based on the 1,3-dipolar cycloaddition of the cyclic nitrone 4a derived from proline and acrylamide, followed by a
Synthesis of nitrones by methyltrioxorhenium catalyzed direct oxidation of secondary amines
作者:Andrea Goti、Luca Nannelli
DOI:10.1016/0040-4039(96)01266-x
日期:1996.8
Oxidation of secondaryamines catalyzed by methyltrioxorhenium (MTO) with H2O2 or urea-hydrogen peroxide complex (UHP) at room temperature gives the corresponding nitrones in good yields.
在室温下,用H 2 O 2或脲-过氧化氢络合物(UHP)将甲基三氧ox(MTO)催化的仲胺氧化,可以得到相应的硝酮,收率很高。
Selenium dioxide catalyzed oxidation of secondary amines with hydrogen peroxide. Simple synthesis of nitrones from secondary amines
作者:Shun-Ichi Murahashi、Tatsuki Shiota
DOI:10.1016/s0040-4039(00)96130-6
日期:——
Oxidation of secondary amines with hydrogen peroxide in the presence of selenium dioxide catalyst at room temperature gives nitrones, which are versatile synthetic intermediates, highly efficiently.
Metal-Free Solvent Promoted Oxidation of Benzylic Secondary Amines to Nitrones with H<sub>2</sub>O<sub>2</sub>
作者:Álisson Silva Granato、Giovanni Wilson Amarante、Javier Adrio
DOI:10.1021/acs.joc.1c01888
日期:2021.10.1
An environmentally benign protocol for the generation of nitrones from benzylic secondary amines via catalyst-free oxidation of secondary amines using H2O2 in MeOH or CH3CN is described. This methodology provides a selective access to a variety of C-aryl nitrones in yields of 60 to 93%. Several studies have been performed to shed light on the reaction mechanism and the role of the solvent.
描述了一种环境友好的方案,用于通过使用MeOH 或 CH 3 CN 中的 H 2 O 2进行仲胺的无催化剂氧化,从苄基仲胺生成硝酮。该方法可以选择性地获得多种 C-芳基硝酮,产率为 60% 至 93%。已经进行了几项研究来阐明反应机理和溶剂的作用。
Oxidation of secondary amines to nitrones using urea-hydrogen peroxide complex (UHP) and metal catalysts
Secondaryamines can be readily oxidized to the corresponding nitrones using urea-hydrogen peroxide complex (UHP) and metal catalysts in methanol at room temperature. Sodium tungstate is the most effective catalyst in several runs and common protecting groups are tolerated in these conditions.